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    "------------\n",
    "* 日期：2022-10-26 \\ week10（周三）\n",
    "* 课程：python\n",
    "* 记录人：zhou\n",
    "------------"
   ]
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    "* 习题:\n",
    "购物车程序项目:\n",
    ">要求:\n",
    ">> 1. 运行程序后，让用户输入支付宝余额，然后打印我们的商品列表给用户. （* 输入：input  列表：list ）\n",
    ">> 2. 让用户输入商品编号进行商品的购买。   （编号：index）\n",
    ">> 3. 用户选择商品后，检查用户的余额是否够，若够则直接扣款，不够则提醒用户。\n",
    ">> 4.  用户可以随时退出购买，推出时打印用户已购买的商品和支付宝余额。"
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    "product_list = [\n",
    "    [\"自行车\",299],\n",
    "    [\"Iphone 14 Pro\",8000],\n",
    "    [\"NFT 盲盒\",28],\n",
    "    [\"许老师的Python书，80\"]\n",
    "]\n",
    "\n",
    "shopping_car = []\n",
    "\n",
    "Alipay = int(input(\"请输入余额:\"))\n",
    "while True:\n",
    "    print(\"-----------------商品列表-----------------\")\n",
    "    for i in range(4):\n",
    "        print(\"商品编号:\"+str(i),product_list[i])\n",
    "    user_chioce = input(\"请输入商品编号:\")\n",
    "    # 情景1：用户输入了商品编号：shopping\n",
    "    if user_chioce.isdigit():\n",
    "    # 判断钱够不够，商品是谁？ ==> product_list[user_chioce][1]\n",
    "        if Alipay >= product_list[int(user_chioce)][1]:\n",
    "            Alipay = Alipay - product_list[int(user_chioce)][1]   # 买完商品剩余的钱\n",
    "            print(\"商品已加入购物车，您的余额还有%s元\"%(AliPay))\n",
    "        else:\n",
    "            print(\"您的月不足，请更换支付方式~~\")\n",
    "    # 情景2：用户输入\"q\",退出购买\n",
    "    elif user_chioce == \"q\":\n",
    "        print(\"您的购物车:\",shopping_car)\n",
    "        print(\"您的余额还有：\",Alipay)\n",
    "        break\n",
    "    else:\n",
    "        print(\"您输入的商品不存在或输入有误，请重新尝试\")"
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